ok first......english.....second i heard you gotto fight nightwolf to get it in netherrelm....after you do that erran for him but i did that and cant find him either so i duno.....im guessing goto earthrelm train with him then fight him in netherrelm

Go outside the main village and take a left, Nightwolf will tell you an oni has his staff, the oni is at the bridge not far from there, punch the oni and get the staff, go back to Nightwolf and give it to him. Then go to the Nexus and then come back to Netherealm. Go to A-4 and then you fight Nightwolf.